Process for purifying liquids



Patented May 19, 1925.

UNITED STATES PATENT OFF-ICE;

ELOI nroean,

or MELLE, FRANCE, Assrenoii- TO soorn'rn BLIGARD, ALL NET & cm,

nIsTrLLERIss nns DEUX-SEVBES, or MELLE, D EUX-SEVRES, FRANCE.

PROCESS FOR PURIFYING' LIQUIDS.

No Drawing. Original application filed. December 24, 1921,

cation filed'May 2'6, 1924-.

To all vii/m it may concern Be it known that I, liro'i ll ronun, acitizen of France, and a resident ot Melle, Deuxf lcvrcs Department,France, have invented new and useful improvements in Processes torPurifying Liquids, which is fully set forth in the followingspecification, which is a division of my application Serial No. 524,763tiled December 24, 1921.

The present invention has for its object a process of purifying liquidsof various kinds, which consists in adding first a suitable quantity ota soluble alginate to the liquid, then a suitable acid, base or easilydecompoundable salt, so as to form a coagulating and clarifyingprecipitate of alginic acid or an insoluble alginate in the mass of theliquid, which when separated from the liquid constitutes a filter cakehaving alimentary or fertilizing properties.

This process may be particularly applied to the purification of thesaccharine juices or liquid.

It is known that in the ordinary saccharine fabrication, the juiceobtained by dittusion, pressure or other means of extraction from theraw material used, is purified for the purpose of removing the greaterpart of the impurities called generally non-sugar.

The purification process universally used consists in causing lime andcarbon dioxide to act on the juice one or several times at raisedtemperature.

For example, for the purification ot the juice from beetroot theoperation is generally as follows:

To 1 hcctolitrc o'l beet juice extracted by ditlusion) heated to about80 (Y, there is added milk of lime corresponding with 22.5 kilos offat). A stream of carbon dioxide is then passed through the mass, inorder to saturate a part of the alkali.

As a result of the physical and chemical actions oi the substancespresent, there forms a heavy precipitate. The mass is filtered under apressure of 2 to 3 kg. per cm. there being obtained, on the one hand,clear juice partially purified and, on the other hand, a residuecontaining the impurities ot the beet mixed with a large quantity ofcalcium carbonatc. This operation constitutes the first cailionatationvTo 1 hectolitre of juice thus obtained there is again added milk of limecorresponding Serial No. 524,763. Divided and this appli- Serial No.718,067.

0:2-0;4, kilos of CaO. A stream of 1a on dioxide is passed through themassfin order to saturate the alkali as exactly as possible and thewhole is then heated to boiling.

There forms a precipitate, the mass is again filtered there beingobtained, on the one hand, clear juice more nearly purified and, on theother hand, a residue containing tor the greater part calcium carbonate.This operation constitutes the second carbonatation. I

The second carbonatation is sometimes followed by a third, e'ltec'tedunder the same conditions. l

By starting with a juice of 88 of purity (88 per cent of sugar in thedry extract) there is obtained an approximate p'urity ot 92 to 92.5 I v7 By the present invention saccharine juices or liquids are purifiedmore simply and more completely by adding to the juice or liquid to bepurified a suitable quantity of a soluble alginate, thus producing inthe juice, at any suitable temperature to 80 C.) a small quantity ofinsoluble alginic acid or alginate forming a coagulating and clarityingagent of considerable eflicacy.

Alginic acid is one of the constituents of a large number of seaweec s,from which it has been extracted industrially for some years in the formof a soluble alginate (of soda, potash, ammonia etc.) These alginatesdissolve to form a hydrosol. hydrosol is treated with an acid, there isproduced insoluble alginic acid, when it is treat ed with lime there isformed insoluble calcium alginate.

The following example illustrates the invention:

To one-hectolitre ot tannin extract there is added a solution of analginate containing 300 grams of pure alginate; the mixture is wellstirred and there are added 50 grams of barium torinate; thoroughstirring then follows and the mixture is left at rest for some minutes.-There is formed a precipi- When thi tate of barium alginate whichentrains the posit on the evaporator, and on the other hand afilter'cake having a certain value as a 'manure.

The purification is the more complete the lower the temperature of theoperation.

The foregoing example does not limit the invention since the presentprocess may be applied With suitable Variations to various liquids.

What I claim i 1 A process for purifying'liquids of va rious kindsconsisting in adding a Water soluble alginate to the mass to bepurified, then adding a salt oi? a metal the alginate of Whichisinsoluble thereby causing a, double decomposition with the al inate inorder to form a precipitate of an insoluble alginate in the mass to bepurified.

A proc'essior purifying saccharine juice consisting in adding aWatersoluble alginate to the mass to bepurified, then adding asalt of ametal the algmate of which is insoluble thereby causing a doubledecomposition with the alginate in order to form aprecipitate "of anmsoluble alginate 1n the mass to be purified. v I e 8. A process tor,purifying hquids of Va rious klndsconsistlng in adding a Water sol ublealginate to the mass to be purified,then adding a salt of a metal thealginate of Which is insoluble thereby causing a double decompositionwith the alginate in order to form a coagulating and clarifyingprecipitate vof an insoluble alginate in the mass to be purified.

4. In a process of purifying liquids of va rious kinds Which consists inadding a Water soluble alginate to the liquid and a salt of a metal thealginate of which is insoluble thereby causing a double decompositionWith the alginate in order to form a coagulating and clarifyingprecipitate, the separation from the liquid of this precipitate in orderto obtain a filter-cake having alimentary or fertilizing properties.

5. A process for purifying saccharine juice Which consists in adding aWater soluble alginate to the mass to be adding barium formate therebycausing a double decomposition With the alginate in order to form aprecipitate of an insoluble alginate in the mass to be purified.

In testimony whereof I have signed this specification.

ELOI RICARD.

purified, and I

